I had the DC 72w powerpacks and I called Lionel about the same question and there answer was I would burn up the circuits using DC power. Legacy engines that can run on Bluetooth still require AC power to function properly. Another thing I discovered is that the Lionel remote switches will only light up green using DC power. When I would switch them they would either be green or no light at all. After I changed to AC power the switch remotes go from red to green.
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